Drain Spud For Whole House Humidifiers. This is the plactic fitting which attaches to the base of the housing of your humidifier. It is designed to allow for the connection of the 1/2" drain hose. Same as Aprilaire # 4223

Drain Spud For Whole House Humidifiers. This is the plactic fitting which attaches to the base of the housing of your humidifier. It is designed to allow for the connection of the 1/2" drain hose. Same as Aprilaire # 4223